Toyota Yaris: Power Integration System / Terminals Of Ecu

Toyota Yaris XP210 (2020-2022) Reapir and Service Manual / Power Source & Network / Power Distribution / Power Integration System / Terminals Of Ecu

TERMINALS OF ECU

NOTICE:

  • After the ignition switch is turned off, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

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  • When disconnecting and reconnecting the auxiliary battery.

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CHECK POWER DISTRIBUTION BOX ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

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*1

Power Distribution Box Assembly

*2

Main Body ECU (Multiplex Network Body ECU)

(b) Reconnect the power distribution box assembly connectors.

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(c) Measure the voltage and resistance according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

MB-13 (GND1) - Body ground

Ground

Always

Below 1 Ω

MB-26 (BECU) - Body ground

Auxiliary battery power supply

Ignition switch off

11 to 14 V

MB-27 (IGR) - Body ground

IG power supply

Ignition switch off

Below 1 V

Ignition switch ON

11 to 14 V

(d) Install the main body ECU (multiplex network body ECU) to power distribution box assembly.

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(e) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

4D-5 - Body ground

CXPI communication line

Ignition switch ON

Pulse generation

4E-43 - Body ground

Rear window defogger signal (output)

rear window defogger switch off

Below 1.5 V

rear window defogger switch on

8 to 14 V

4B-2 - Body ground

Mirror heater drive voltage (output)

Ignition switch ON, rear defogger switch off

Below 1.5 V

Ignition switch ON, rear defogger switch on

8 to 14 V

4C-10 - Body ground

Power retract mirror motor drive voltage (output)

Outer rear view mirror assembly moves to the retracted position

Below 1.5 V

Outer rear view mirror assembly not move

8 to 14 V

4C-21 - Body ground

Power retract mirror motor drive voltage (output)

Outer rear view mirror assembly moves to the return position

Below 1.5 V

Outer rear view mirror assembly not move

8 to 14 V

CHECK SEMICONDUCTOR POWER INTEGRATION ECU

*a

Component without harness connected

(Semiconductor power integration ECU)

-

-

(a) Disconnect the cable from the negative (-) auxiliary battery terminal.

(b) Disconnect the A85 and A86 semiconductor power integration ECU connectors.

(c) Connect the cable to the negative (-) auxiliary battery terminal.

(d) Measure the resistance and voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A85-1 (+B) - Body ground

Auxiliary battery power supply

Ignition switch off

8 to 14 V

A86-5 (-S) - Body ground

Headlight ECU sub-assembly operation signal input

Ignition switch off

6 V or higher

Ignition switch ON

Below 1.7 V

A86-16 (GND2) - Body ground

Ground

Always

Below 1 Ω

A86-20 (IG) - Body ground

IG power supply

Ignition switch off

Below 1.5 V

Ignition switch ON

8 to 14 V

A86-24 (-S) - Body ground

Headlight ECU sub-assembly operation signal input

Ignition switch off

6 V or higher

Ignition switch ON

Below 1.7 V

A86-26 (GND1) - Body ground

Ground

Always

Below 1 Ω

(e) Reconnect the A85 and A86 semiconductor power integration ECU connectors.

(f) Measure the voltage and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Terminal Description

Condition

Specified Condition

A86-8 (CXPI) - Body ground

CXPI communication line

Ignition switch ON

Pulse generation

A86-1 (L) - Body ground

Headlight ECU sub-assembly LH power supply

Ignition switch off

Below 3.0 V

Ignition switch ON

8 V or higher

A86-2 (L)- Body ground

Headlight ECU sub-assembly RH power supply

Ignition switch off

Below 3.0 V

Ignition switch ON

8 V or higher

A86-17 (L) - Body ground

Front fog light output

Front fog light not illuminated

Below 3.0 V

Front fog light illuminated

8 V or higher

A86-18 (L) - Body ground

Front fog light output

Front fog light not illuminated

Below 3.0 V

Front fog light illuminated

8 V or higher

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    Break-In Period

    No special break-in is necessary, but a few precautions in the first 600 miles (1,000 km) may add to the performance, economy, and life of the vehicle.

    Do not race the engine. Do not maintain one constant speed, either slow or fast, for a long period of time. Do not drive constantly at full-throttle or high engine rpm for extended periods of time. Avoid unnecessary hard stops. Avoid full-throttle starts.

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